The UK Government has issued a Greening Government strategy. The UK claims to be the first Government to set out a strategy for reducing the environmental impact of computer systems and has an ambitious target to be carbon neutral by 2012.

See:

• Greening Government ICT ("The Strategy") (PDF version, 716KB): This 17 page document details both how ICT can reduce its own energy consumption and contribute to effeicienes in other areas of government activity.
  
• Areas for Potential Carbon Reduction [PDF, 196KB, 8 pages]: This eight page document tabulates the Potential Areas for Carbon Reduction from Appendix B of the Greening Government ICT.
  Strategy: Efficient, Sustainable, Responsible.
  
• Green ICT SOGE Map (PDF, 110KB: This is a two page document showing where ICT can be used to help implement the UK's energy reduction strategy.

Some excerpts from the report are available.